Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 783 251
2) Placement test : grammar for beginners (anonyme) 6 001 005
3) A/AN (webmaster) 5 370 512
4) Auxiliary BE (webmaster) 3 226 832
5) Present continuous (webmaster) 3 002 749
6) Present simple (webmaster) 2 924 667
7) Present simple (webmaster) 2 600 651
8) Present continuous (webmaster) 2 440 217
9) Adjectives (webmaster) 2 095 237
10) A/an (anonyme) 2 018 319
11) Present perfect simple (webmaster) 1 649 730
12) Preterite (webmaster) 1 636 359
13) Vocabulary - Placement test (bridg) 1 620 758
14) Preterite (webmaster) 1 452 365
15) Short placement test (webmaster) 1 444 922
16) To be (bridg) 1 407 881
17) Present perfect (webmaster) 1 351 378
18) What time is it? (webmaster) 1 351 036
19) The alphabet in English (webmaster) 1 322 619
20) Adjectives (anonyme) 1 217 539
21) What time is it? (webmaster) 1 211 464
22) Numbers (webmaster) 1 189 557
23) 'A' ou 'An' (anonyme) 1 177 730
24) Two presents: present continuous, present simple (webmaster) 1 151 358
25) To be (bridg) 1 146 884
26) Comparatives / Superlatives (webmaster) 1 109 777
27) Numbers (webmaster) 1 072 261
28) CAN / MUST (webmaster) 1 059 829
29) THE/ A / AN / nothing (webmaster) 1 036 223
30) Comparatives (webmaster) 1 008 376
31) Family life (bridg) 1 002 144
32) Numbers > 100 (webmaster) 987 500
33) Future (going to/will/present continuous) (anonyme) 966 346
34) Plural (webmaster) 956 998
35) Superlatives (webmaster) 876 408
36) Adjectives (anonyme) 875 938
37) Simple present (bridg) 855 417
38) Spelled words N°1 (bridg) 851 339
39) Placement test beginners: Check your spelling (anonyme) 830 754
40) Introducing oneself (webmaster) 827 951
41) Adverbs of frequency (anonyme) 819 416
42) Family (bridg) 785 835
43) General test-End of high school / Beginning of university (webmaster) 783 947
44) Present simple (anonyme) 783 579
45) Frequency adverbs (webmaster) 778 752
46) Present BE + Ving (bridg) 766 903
47) Passive form (anonyme) 730 705
48) Genitive (webmaster) 724 481
49) Family tree (anonyme) 720 324
50) Preterite: simple or continuous? (webmaster) 718 286
51) Placement test (beginners) (lili73) 702 593
52) Past simple or present perfect (anonyme) 697 227
53) Future (webmaster) 676 740
54) Present perfect simple (bridg) 664 510
55) 2 Preterites (webmaster) 663 781
56) Preterite (webmaster) 622 667
57) List of 200 irregular verbs and audio (bridg) 617 466
58) Modals (webmaster) 613 468
59) Spelled words N°2 (bridg) 610 110
60) Modals (webmaster) 608 029
61) Height (webmaster) 606 942
62) Articles a / an / the (anonyme) 596 783
63) Plural forms (bridg) 578 572
64) Nationalities (webmaster) 575 047
65) Past continuous / Past simple (anonyme) 569 534
66) Irregular plurals (bridg) 554 598
67) Two presents: simple and continuous (webmaster) 550 528
68) Preterite (bridg) 550 027
69) Superlatives (frapedur) 541 999
70) Vocabulary: greeting people (here4u) 536 582
71) Give your opinion (bridg) 532 823
72) Adverbs of Frequency (bridg) 517 723
73) Present simple or continuous (anonyme) 513 318
74) Present perfect / preterite ? (anonyme) 512 370
75) Possessive case (anonyme) 481 382
76) Countries & nationalities (bridg) 474 340
77) Past tenses (bridg) 472 138
78) 'The' or nothing? (webmaster) 471 801
79) Introducing oneself (easy) (webmaster) 471 265
80) Passive voice (webmaster) 464 889
81) Present Simple vs. Past Simple (anonyme) 460 027
82) Questions : how to ask them (anonyme) 449 132
83) General Test II / End of high school / Beginning of universi (webmaster) 446 807
84) IN, ON, AT or TO? (webmaster) 446 275
85) Relative pronouns (webmaster) 445 990
86) Comparative of superiority (anonyme) 440 564
87) How to pronounce the final -ED? (past simple) (webmaster) 439 485
88) Relative clauses (webmaster) 424 192
89) Sounds: [h] (webmaster) 419 961
90) Comparative (anonyme) 415 273
91) Past simple (anonyme) 400 209
92) A/an/Ø (bridg) 399 705
93) Future simple (anonyme) 397 627
94) This / That / These / Those (webmaster) 393 133
95) Conditional (webmaster) 392 640
96) Passive voice (anonyme) 391 784
97) Comparing (webmaster) 388 532
98) Can / could/ may/ might (woodyrun) 380 610
99) Present perfect or past tense (anonyme) 379 106
100) Much, many, little and few (felin) 374 571
101) Personal pronouns (anonyme) 371 626
102) Preterite continuous (BE + -ING) (webmaster) 370 907
103) Genitive case (bridg) 368 950
104) Some, any, no, enough, too/too much/too many (webmaster) 368 642
105) Confusing words - Placement test (bridg) 364 926
106) Irregular verbs (webmaster) 364 428
107) Numbers from 1 to 10 (anonyme) 362 001
108) Past perfect simple, past perfect continuous (anonyme) 361 202
109) Present continuous or present simple (webmaster) 360 051
110) Present perfect or preterite? (anonyme) 358 736
111) Simple Past : regular verbs (anonyme) 354 677
112) Comparative Adjectives (bridg) 352 715
113) Who, Whom, Which, or Whose? (anonyme) 349 690
114) Past simple (video) (anonyme) 349 370
115) Past simple or past continuous (anonyme) 345 353
116) While / When (anonyme) 340 638
117) What time is it? (webmaster) 338 539
118) Modals (tinou) 337 116
119) Modal: may/might (anonyme) 334 652
120) Cardinal and ordinal numbers (anonyme) 329 203
121) The superlative (anonyme) 327 551
122) Possessive adjectives and pronouns (woodyrun) 324 963
123) How to talk about the weather (lili73) 320 960
124) Since and for (anonyme) 319 676
125) Flags (webmaster) 318 033
126) Irregular verbs (bridg) 316 604
127) Pronouns (woodyrun) 315 290
128) Prepositions - in, on, at (anonyme) 314 529
129) Tenses (anonyme) 312 884
130) Placement test 3 (webmaster) 310 903
131) Order of adjectives (webmaster) 307 008
132) Could/Couldn't (laure95) 306 642
133) Comparative (anonyme) 305 268
134) Adjectives and prepositions (anonyme) 304 507
135) Agreement Tags (webmaster) 304 445
136) Asking questions (webmaster) 303 631
137) Present perfect OR simple past? (bridg) 298 795
138) Questions in the past tense (anonyme) 298 381
139) Uncountable nouns (webmaster) 296 445
140) Superlative Adjectives (bridg) 296 306
141) Object pronouns (bridg) 296 163
142) Passive form (anonyme) 293 646
143) Placement test 1 (anonyme) 293 303
144) Present simple (anonyme) 292 115
145) Can/Must/Should (laure95) 291 059
146) Past perfect (lili73) 290 282
147) Prefer/rather (bridg) 290 009
148) Must or Have to? (woodyrun) 288 351
149) The/an/nothing (bridg) 285 770
150) To be (anonyme) 283 642
151) Can and can't (laure95) 282 893
152) Vocabulary: asking and answering (here4u) 280 492
153) Modal verbs (bridg) 277 632
154) Some / Any / no... (bridg) 274 982
155) Days of the week (bridg) 269 198
156) So / neither (anonyme) 264 590
157) Past simple (video) (anonyme) 264 093
158) Present continuous (chnawa) 261 810
159) Used to (bridg) 260 546
160) Should / must (anonyme) 260 230
161) Past tense (anonyme) 259 697
162) Vocabulary: on the phone (here4u) 258 815
163) Find out a quantity (webmaster) 258 751
164) Articles : a / an / the / Ø (anonyme) 258 308
165) Superlative + and adjective (anonyme) 257 765
166) Comparative and superlative (anonyme) 257 103
167) Numbers 1/100 (anonyme) 253 938
168) Modal can (video) (anonyme) 253 350
169) Comparatives (anonyme) 250 966
170) Relatives pronouns (who, which, that...) (anonyme) 247 890
171) A few, a little, few, little (anonyme) 246 289
172) Vocabulary: at the restaurant (here4u) 245 707
173) Would rather / would prefer to (anonyme) 244 779
174) Present continuous and the Going to form (anonyme) 243 216
175) Should/ have to/ must (anonyme) 240 974
176) Have something done (anonyme) 240 111
177) Used to/would (woodyrun) 238 213
178) The past (webmaster) 238 015
179) Future continuous and future perfect. (felin) 237 990
180) How to ask a question in English (bridg) 236 060
181) Pluperfect (webmaster) 234 424
182) I wish, if only (felin) 234 336
183) Some / any (younes91) 233 898
184) Countable or Uncountable? (webmaster) 233 765
185) Should / shouldn't (anonyme) 231 957
186) Present simple or continuous (bridg) 230 834
187) Adjectives - ing and ed (felin) 229 450
188) Hypothesis (webmaster) 228 641
189) Must or mustn't (laure95) 226 740
190) Auxiliary BE (anonyme) 226 604
191) Articles a/an/the/0 (bridg) 226 463
192) Article The or nothing (anonyme) 226 262
193) Present perfect with Ever - never - (anonyme) 226 138
194) Present continuous OR Present simple? (bridg) 225 704
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 223 126
196) To / in order to / so as to / so that (irish21) 221 006
197) Comparison (komiks) 220 899
198) Present perfect (bridg) 219 782
199) What time is it ? (anonyme) 217 893
200) Indirect speech (bridg) 217 746
