Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 775 885
2) Placement test : grammar for beginners (anonyme) 5 987 672
3) A/AN (webmaster) 5 362 627
4) Auxiliary BE (webmaster) 3 222 960
5) Present continuous (webmaster) 2 997 653
6) Present simple (webmaster) 2 909 508
7) Present simple (webmaster) 2 595 925
8) Present continuous (webmaster) 2 431 234
9) Adjectives (webmaster) 2 092 760
10) A/an (anonyme) 2 013 908
11) Present perfect simple (webmaster) 1 640 445
12) Preterite (webmaster) 1 624 110
13) Vocabulary - Placement test (bridg) 1 618 579
14) Preterite (webmaster) 1 445 056
15) Short placement test (webmaster) 1 442 959
16) To be (bridg) 1 405 395
17) What time is it? (webmaster) 1 348 449
18) Present perfect (webmaster) 1 343 890
19) The alphabet in English (webmaster) 1 320 308
20) Adjectives (anonyme) 1 215 147
21) What time is it? (webmaster) 1 206 856
22) Numbers (webmaster) 1 188 156
23) 'A' ou 'An' (anonyme) 1 174 413
24) Two presents: present continuous, present simple (webmaster) 1 148 413
25) To be (bridg) 1 144 891
26) Comparatives / Superlatives (webmaster) 1 101 442
27) Numbers (webmaster) 1 070 056
28) CAN / MUST (webmaster) 1 057 993
29) THE/ A / AN / nothing (webmaster) 1 032 326
30) Comparatives (webmaster) 1 006 675
31) Family life (bridg) 1 000 112
32) Numbers > 100 (webmaster) 985 955
33) Future (going to/will/present continuous) (anonyme) 962 717
34) Plural (webmaster) 955 198
35) Superlatives (webmaster) 874 572
36) Adjectives (anonyme) 874 212
37) Simple present (bridg) 853 213
38) Spelled words N°1 (bridg) 849 648
39) Placement test beginners: Check your spelling (anonyme) 829 818
40) Introducing oneself (webmaster) 826 853
41) Adverbs of frequency (anonyme) 816 424
42) Family (bridg) 784 163
43) General test-End of high school / Beginning of university (webmaster) 782 307
44) Present simple (anonyme) 779 193
45) Frequency adverbs (webmaster) 777 363
46) Present BE + Ving (bridg) 764 449
47) Genitive (webmaster) 723 170
48) Family tree (anonyme) 718 983
49) Passive form (anonyme) 717 956
50) Preterite: simple or continuous? (webmaster) 715 825
51) Placement test (beginners) (lili73) 700 475
52) Past simple or present perfect (anonyme) 692 830
53) Future (webmaster) 675 538
54) 2 Preterites (webmaster) 661 304
55) Present perfect simple (bridg) 659 248
56) Preterite (webmaster) 619 598
57) List of 200 irregular verbs and audio (bridg) 615 526
58) Modals (webmaster) 612 371
59) Spelled words N°2 (bridg) 608 779
60) Height (webmaster) 606 065
61) Modals (webmaster) 604 351
62) Articles a / an / the (anonyme) 596 740
63) Plural forms (bridg) 576 952
64) Nationalities (webmaster) 573 886
65) Past continuous / Past simple (anonyme) 564 894
66) Irregular plurals (bridg) 553 169
67) Two presents: simple and continuous (webmaster) 549 188
68) Preterite (bridg) 548 506
69) Superlatives (frapedur) 536 986
70) Vocabulary: greeting people (here4u) 536 440
71) Give your opinion (bridg) 531 555
72) Adverbs of Frequency (bridg) 516 649
73) Present simple or continuous (anonyme) 509 631
74) Present perfect / preterite ? (anonyme) 508 086
75) Possessive case (anonyme) 480 232
76) Countries & nationalities (bridg) 473 004
77) 'The' or nothing? (webmaster) 471 001
78) Introducing oneself (easy) (webmaster) 470 482
79) Past tenses (bridg) 470 260
80) Passive voice (webmaster) 462 383
81) Present Simple vs. Past Simple (anonyme) 455 982
82) Questions : how to ask them (anonyme) 447 886
83) General Test II / End of high school / Beginning of universi (webmaster) 445 873
84) IN, ON, AT or TO? (webmaster) 444 669
85) Relative pronouns (webmaster) 443 806
86) Comparative of superiority (anonyme) 437 802
87) How to pronounce the final -ED? (past simple) (webmaster) 436 895
88) Relative clauses (webmaster) 422 938
89) Sounds: [h] (webmaster) 419 296
90) Comparative (anonyme) 412 872
91) A/an/Ø (bridg) 398 317
92) Future simple (anonyme) 395 776
93) Past simple (anonyme) 395 483
94) This / That / These / Those (webmaster) 392 262
95) Conditional (webmaster) 391 272
96) Passive voice (anonyme) 389 995
97) Comparing (webmaster) 387 772
98) Can / could/ may/ might (woodyrun) 379 026
99) Present perfect or past tense (anonyme) 376 573
100) Much, many, little and few (felin) 372 013
101) Personal pronouns (anonyme) 371 204
102) Preterite continuous (BE + -ING) (webmaster) 368 411
103) Some, any, no, enough, too/too much/too many (webmaster) 367 910
104) Genitive case (bridg) 367 559
105) Confusing words - Placement test (bridg) 364 430
106) Irregular verbs (webmaster) 363 250
107) Numbers from 1 to 10 (anonyme) 361 308
108) Past perfect simple, past perfect continuous (anonyme) 360 728
109) Present continuous or present simple (webmaster) 359 349
110) Present perfect or preterite? (anonyme) 356 079
111) Simple Past : regular verbs (anonyme) 352 277
112) Comparative Adjectives (bridg) 351 974
113) Who, Whom, Which, or Whose? (anonyme) 348 452
114) Past simple (video) (anonyme) 347 884
115) Past simple or past continuous (anonyme) 341 266
116) While / When (anonyme) 337 965
117) What time is it? (webmaster) 337 487
118) Modals (tinou) 336 284
119) Modal: may/might (anonyme) 333 934
120) Cardinal and ordinal numbers (anonyme) 328 491
121) The superlative (anonyme) 324 309
122) Possessive adjectives and pronouns (woodyrun) 323 878
123) How to talk about the weather (lili73) 320 856
124) Since and for (anonyme) 318 358
125) Flags (webmaster) 317 326
126) Irregular verbs (bridg) 315 714
127) Prepositions - in, on, at (anonyme) 313 934
128) Pronouns (woodyrun) 312 985
129) Tenses (anonyme) 311 554
130) Placement test 3 (webmaster) 310 227
131) Order of adjectives (webmaster) 306 376
132) Could/Couldn't (laure95) 305 624
133) Comparative (anonyme) 304 266
134) Adjectives and prepositions (anonyme) 303 898
135) Agreement Tags (webmaster) 303 835
136) Asking questions (webmaster) 302 892
137) Present perfect OR simple past? (bridg) 298 149
138) Questions in the past tense (anonyme) 297 209
139) Superlative Adjectives (bridg) 295 525
140) Uncountable nouns (webmaster) 295 399
141) Object pronouns (bridg) 294 440
142) Placement test 1 (anonyme) 292 506
143) Present simple (anonyme) 290 630
144) Passive form (anonyme) 289 802
145) Prefer/rather (bridg) 289 080
146) Can/Must/Should (laure95) 288 730
147) Past perfect (lili73) 287 000
148) Must or Have to? (woodyrun) 286 826
149) The/an/nothing (bridg) 284 910
150) To be (anonyme) 283 346
151) Vocabulary: asking and answering (here4u) 280 425
152) Can and can't (laure95) 280 329
153) Modal verbs (bridg) 277 088
154) Some / Any / no... (bridg) 270 175
155) Days of the week (bridg) 269 039
156) So / neither (anonyme) 264 219
157) Past simple (video) (anonyme) 263 508
158) Used to (bridg) 260 225
159) Should / must (anonyme) 259 290
160) Present continuous (chnawa) 259 196
161) Past tense (anonyme) 259 100
162) Vocabulary: on the phone (here4u) 258 702
163) Find out a quantity (webmaster) 258 450
164) Superlative + and adjective (anonyme) 256 979
165) Articles : a / an / the / Ø (anonyme) 255 877
166) Comparative and superlative (anonyme) 254 463
167) Numbers 1/100 (anonyme) 253 374
168) Modal can (video) (anonyme) 252 700
169) Relatives pronouns (who, which, that...) (anonyme) 247 799
170) Comparatives (anonyme) 246 137
171) Vocabulary: at the restaurant (here4u) 245 637
172) A few, a little, few, little (anonyme) 244 955
173) Would rather / would prefer to (anonyme) 244 134
174) Present continuous and the Going to form (anonyme) 242 335
175) Have something done (anonyme) 239 652
176) Should/ have to/ must (anonyme) 239 579
177) The past (webmaster) 237 709
178) Future continuous and future perfect. (felin) 237 416
179) Used to/would (woodyrun) 237 215
180) How to ask a question in English (bridg) 235 041
181) I wish, if only (felin) 233 934
182) Pluperfect (webmaster) 233 694
183) Countable or Uncountable? (webmaster) 232 969
184) Some / any (younes91) 232 132
185) Should / shouldn't (anonyme) 231 170
186) Present simple or continuous (bridg) 230 768
187) Adjectives - ing and ed (felin) 228 671
188) Hypothesis (webmaster) 227 893
189) Auxiliary BE (anonyme) 226 271
190) Articles a/an/the/0 (bridg) 226 076
191) Article The or nothing (anonyme) 225 762
192) Present perfect with Ever - never - (anonyme) 225 346
193) Present continuous OR Present simple? (bridg) 225 219
194) Must or mustn't (laure95) 224 840
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 222 663
196) To / in order to / so as to / so that (irish21) 219 683
197) Present perfect (bridg) 219 335
198) What time is it ? (anonyme) 217 532
199) Comparison (komiks) 217 428
200) Indirect speech (bridg) 216 059
