Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 781 154
2) Placement test : grammar for beginners (anonyme) 5 996 860
3) A/AN (webmaster) 5 368 366
4) Auxiliary BE (webmaster) 3 225 789
5) Present continuous (webmaster) 3 001 160
6) Present simple (webmaster) 2 919 558
7) Present simple (webmaster) 2 599 179
8) Present continuous (webmaster) 2 437 606
9) Adjectives (webmaster) 2 094 551
10) A/an (anonyme) 2 017 062
11) Present perfect simple (webmaster) 1 646 621
12) Preterite (webmaster) 1 632 252
13) Vocabulary - Placement test (bridg) 1 620 126
14) Preterite (webmaster) 1 450 162
15) Short placement test (webmaster) 1 444 322
16) To be (bridg) 1 407 215
17) What time is it? (webmaster) 1 350 313
18) Present perfect (webmaster) 1 348 785
19) The alphabet in English (webmaster) 1 322 036
20) Adjectives (anonyme) 1 216 833
21) What time is it? (webmaster) 1 210 015
22) Numbers (webmaster) 1 189 119
23) 'A' ou 'An' (anonyme) 1 176 806
24) Two presents: present continuous, present simple (webmaster) 1 150 476
25) To be (bridg) 1 146 342
26) Comparatives / Superlatives (webmaster) 1 106 914
27) Numbers (webmaster) 1 071 581
28) CAN / MUST (webmaster) 1 059 315
29) THE/ A / AN / nothing (webmaster) 1 035 168
30) Comparatives (webmaster) 1 007 870
31) Family life (bridg) 1 001 608
32) Numbers > 100 (webmaster) 987 098
33) Future (going to/will/present continuous) (anonyme) 965 194
34) Plural (webmaster) 956 452
35) Superlatives (webmaster) 875 910
36) Adjectives (anonyme) 875 454
37) Simple present (bridg) 854 714
38) Spelled words N°1 (bridg) 850 870
39) Placement test beginners: Check your spelling (anonyme) 830 466
40) Introducing oneself (webmaster) 827 613
41) Adverbs of frequency (anonyme) 818 472
42) Family (bridg) 785 420
43) General test-End of high school / Beginning of university (webmaster) 783 502
44) Present simple (anonyme) 782 157
45) Frequency adverbs (webmaster) 778 290
46) Present BE + Ving (bridg) 766 109
47) Passive form (anonyme) 726 114
48) Genitive (webmaster) 724 197
49) Family tree (anonyme) 719 944
50) Preterite: simple or continuous? (webmaster) 717 646
51) Placement test (beginners) (lili73) 701 913
52) Past simple or present perfect (anonyme) 695 661
53) Future (webmaster) 676 403
54) 2 Preterites (webmaster) 662 942
55) Present perfect simple (bridg) 662 828
56) Preterite (webmaster) 621 696
57) List of 200 irregular verbs and audio (bridg) 616 817
58) Modals (webmaster) 613 175
59) Spelled words N°2 (bridg) 609 747
60) Modals (webmaster) 606 767
61) Height (webmaster) 606 716
62) Articles a / an / the (anonyme) 596 773
63) Plural forms (bridg) 578 044
64) Nationalities (webmaster) 574 702
65) Past continuous / Past simple (anonyme) 567 896
66) Irregular plurals (bridg) 554 152
67) Two presents: simple and continuous (webmaster) 550 163
68) Preterite (bridg) 549 549
69) Superlatives (frapedur) 540 368
70) Vocabulary: greeting people (here4u) 536 531
71) Give your opinion (bridg) 532 469
72) Adverbs of Frequency (bridg) 517 372
73) Present simple or continuous (anonyme) 512 432
74) Present perfect / preterite ? (anonyme) 510 842
75) Possessive case (anonyme) 481 091
76) Countries & nationalities (bridg) 473 943
77) 'The' or nothing? (webmaster) 471 565
78) Past tenses (bridg) 471 535
79) Introducing oneself (easy) (webmaster) 471 025
80) Passive voice (webmaster) 464 181
81) Present Simple vs. Past Simple (anonyme) 458 958
82) Questions : how to ask them (anonyme) 448 829
83) General Test II / End of high school / Beginning of universi (webmaster) 446 509
84) IN, ON, AT or TO? (webmaster) 445 851
85) Relative pronouns (webmaster) 445 174
86) Comparative of superiority (anonyme) 439 477
87) How to pronounce the final -ED? (past simple) (webmaster) 438 690
88) Relative clauses (webmaster) 423 799
89) Sounds: [h] (webmaster) 419 779
90) Comparative (anonyme) 414 443
91) A/an/Ø (bridg) 399 278
92) Past simple (anonyme) 398 775
93) Future simple (anonyme) 396 981
94) This / That / These / Those (webmaster) 392 861
95) Conditional (webmaster) 392 118
96) Passive voice (anonyme) 391 202
97) Comparing (webmaster) 388 321
98) Can / could/ may/ might (woodyrun) 380 120
99) Present perfect or past tense (anonyme) 378 276
100) Much, many, little and few (felin) 373 564
101) Personal pronouns (anonyme) 371 459
102) Preterite continuous (BE + -ING) (webmaster) 370 102
103) Genitive case (bridg) 368 551
104) Some, any, no, enough, too/too much/too many (webmaster) 368 470
105) Confusing words - Placement test (bridg) 364 793
106) Irregular verbs (webmaster) 363 993
107) Numbers from 1 to 10 (anonyme) 361 784
108) Past perfect simple, past perfect continuous (anonyme) 361 073
109) Present continuous or present simple (webmaster) 359 865
110) Present perfect or preterite? (anonyme) 357 809
111) Simple Past : regular verbs (anonyme) 353 776
112) Comparative Adjectives (bridg) 352 502
113) Who, Whom, Which, or Whose? (anonyme) 349 271
114) Past simple (video) (anonyme) 348 944
115) Past simple or past continuous (anonyme) 343 968
116) While / When (anonyme) 339 826
117) What time is it? (webmaster) 338 303
118) Modals (tinou) 336 850
119) Modal: may/might (anonyme) 334 446
120) Cardinal and ordinal numbers (anonyme) 328 964
121) The superlative (anonyme) 326 570
122) Possessive adjectives and pronouns (woodyrun) 324 695
123) How to talk about the weather (lili73) 320 927
124) Since and for (anonyme) 319 288
125) Flags (webmaster) 317 823
126) Irregular verbs (bridg) 316 343
127) Pronouns (woodyrun) 314 500
128) Prepositions - in, on, at (anonyme) 314 308
129) Tenses (anonyme) 312 496
130) Placement test 3 (webmaster) 310 767
131) Order of adjectives (webmaster) 306 806
132) Could/Couldn't (laure95) 306 277
133) Comparative (anonyme) 304 952
134) Adjectives and prepositions (anonyme) 304 295
135) Agreement Tags (webmaster) 304 274
136) Asking questions (webmaster) 303 448
137) Present perfect OR simple past? (bridg) 298 622
138) Questions in the past tense (anonyme) 297 853
139) Uncountable nouns (webmaster) 296 173
140) Superlative Adjectives (bridg) 296 056
141) Object pronouns (bridg) 295 511
142) Placement test 1 (anonyme) 293 067
143) Passive form (anonyme) 292 207
144) Present simple (anonyme) 291 636
145) Can/Must/Should (laure95) 290 425
146) Prefer/rather (bridg) 289 754
147) Past perfect (lili73) 289 157
148) Must or Have to? (woodyrun) 287 947
149) The/an/nothing (bridg) 285 498
150) To be (anonyme) 283 571
151) Can and can't (laure95) 282 114
152) Vocabulary: asking and answering (here4u) 280 474
153) Modal verbs (bridg) 277 472
154) Some / Any / no... (bridg) 274 267
155) Days of the week (bridg) 269 143
156) So / neither (anonyme) 264 479
157) Past simple (video) (anonyme) 263 910
158) Present continuous (chnawa) 261 029
159) Used to (bridg) 260 500
160) Should / must (anonyme) 259 954
161) Past tense (anonyme) 259 534
162) Vocabulary: on the phone (here4u) 258 793
163) Find out a quantity (webmaster) 258 671
164) Articles : a / an / the / Ø (anonyme) 257 572
165) Superlative + and adjective (anonyme) 257 496
166) Comparative and superlative (anonyme) 255 998
167) Numbers 1/100 (anonyme) 253 802
168) Modal can (video) (anonyme) 253 167
169) Comparatives (anonyme) 249 369
170) Relatives pronouns (who, which, that...) (anonyme) 247 866
171) A few, a little, few, little (anonyme) 245 846
172) Vocabulary: at the restaurant (here4u) 245 691
173) Would rather / would prefer to (anonyme) 244 579
174) Present continuous and the Going to form (anonyme) 242 919
175) Should/ have to/ must (anonyme) 240 460
176) Have something done (anonyme) 239 971
177) The past (webmaster) 237 924
178) Used to/would (woodyrun) 237 893
179) Future continuous and future perfect. (felin) 237 827
180) How to ask a question in English (bridg) 235 748
181) I wish, if only (felin) 234 212
182) Pluperfect (webmaster) 234 208
183) Countable or Uncountable? (webmaster) 233 457
184) Some / any (younes91) 233 273
185) Should / shouldn't (anonyme) 231 729
186) Present simple or continuous (bridg) 230 806
187) Adjectives - ing and ed (felin) 229 279
188) Hypothesis (webmaster) 228 427
189) Auxiliary BE (anonyme) 226 545
190) Articles a/an/the/0 (bridg) 226 397
191) Article The or nothing (anonyme) 226 159
192) Must or mustn't (laure95) 226 076
193) Present perfect with Ever - never - (anonyme) 225 926
194) Present continuous OR Present simple? (bridg) 225 605
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 222 947
196) To / in order to / so as to / so that (irish21) 220 729
197) Comparison (komiks) 219 871
198) Present perfect (bridg) 219 645
199) What time is it ? (anonyme) 217 762
200) Indirect speech (bridg) 217 112
