Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 771 746
2) Placement test : grammar for beginners (lucile83) 5 980 820
3) A/AN (webmaster) 5 358 068
4) Auxiliary BE (webmaster) 3 220 820
5) Present continuous (webmaster) 2 994 551
6) Present simple (webmaster) 2 900 095
7) Present simple (webmaster) 2 593 214
8) Present continuous (webmaster) 2 425 067
9) Adjectives (webmaster) 2 091 408
10) A/an (anonyme) 2 011 409
11) Present perfect simple (webmaster) 1 635 880
12) Vocabulary - Placement test (bridg) 1 617 443
13) Preterite (webmaster) 1 616 701
14) Short placement test (webmaster) 1 441 812
15) Preterite (webmaster) 1 440 522
16) To be (bridg) 1 403 797
17) What time is it? (webmaster) 1 346 895
18) Present perfect (webmaster) 1 339 645
19) The alphabet in English (webmaster) 1 319 004
20) Adjectives (lucile83) 1 213 702
21) What time is it? (webmaster) 1 204 505
22) Numbers (webmaster) 1 187 357
23) 'A' ou 'An' (anonyme) 1 172 358
24) Two presents: present continuous, present simple (webmaster) 1 146 347
25) To be (bridg) 1 143 692
26) Comparatives / Superlatives (webmaster) 1 096 822
27) Numbers (webmaster) 1 068 716
28) CAN / MUST (webmaster) 1 057 146
29) THE/ A / AN / nothing (webmaster) 1 029 701
30) Comparatives (webmaster) 1 005 828
31) Family life (bridg) 998 949
32) Numbers > 100 (webmaster) 985 111
33) Future (going to/will/present continuous) (anonyme) 961 035
34) Plural (webmaster) 954 155
35) Superlatives (webmaster) 873 500
36) Adjectives (anonyme) 873 116
37) Simple present (bridg) 852 026
38) Spelled words N°1 (bridg) 848 541
39) Placement test beginners: Check your spelling (lucile83) 829 360
40) Introducing oneself (webmaster) 826 195
41) Adverbs of frequency (lucile83) 814 557
42) Family (bridg) 783 241
43) General test-End of high school / Beginning of university (webmaster) 781 163
44) Present simple (lucile83) 777 107
45) Frequency adverbs (webmaster) 776 504
46) Present BE + Ving (bridg) 763 087
47) Genitive (webmaster) 722 381
48) Family tree (anonyme) 718 107
49) Preterite: simple or continuous? (webmaster) 714 576
50) Passive form (lucile83) 711 160
51) Placement test (beginners) (lili73) 699 497
52) Past simple or present perfect (lucile83) 690 570
53) Future (webmaster) 674 920
54) 2 Preterites (webmaster) 660 100
55) Present perfect simple (bridg) 656 504
56) Preterite (webmaster) 617 733
57) List of 200 irregular verbs and audio (bridg) 614 484
58) Modals (webmaster) 611 790
59) Spelled words N°2 (bridg) 607 979
60) Height (webmaster) 605 516
61) Modals (webmaster) 602 403
62) Articles a / an / the (lucile83) 596 704
63) Plural forms (bridg) 576 072
64) Nationalities (webmaster) 573 221
65) Past continuous / Past simple (anonyme) 561 282
66) Irregular plurals (bridg) 552 353
67) Two presents: simple and continuous (webmaster) 548 471
68) Preterite (bridg) 547 713
69) Vocabulary: greeting people (here4u) 536 368
70) Superlatives (frapedur) 534 200
71) Give your opinion (bridg) 530 756
72) Adverbs of Frequency (bridg) 516 066
73) Present simple or continuous (lucile83) 506 948
74) Present perfect / preterite ? (anonyme) 505 679
75) Possessive case (anonyme) 479 580
76) Countries & nationalities (bridg) 472 173
77) 'The' or nothing? (webmaster) 470 419
78) Introducing oneself (easy) (webmaster) 470 050
79) Past tenses (bridg) 469 276
80) Passive voice (webmaster) 461 227
81) Present Simple vs. Past Simple (anonyme) 454 026
82) Questions : how to ask them (lucile83) 447 195
83) General Test II / End of high school / Beginning of universi (webmaster) 445 397
84) IN, ON, AT or TO? (webmaster) 443 960
85) Relative pronouns (webmaster) 442 935
86) Comparative of superiority (lucile83) 436 336
87) How to pronounce the final -ED? (past simple) (webmaster) 435 509
88) Relative clauses (webmaster) 422 326
89) Sounds: [h] (webmaster) 418 881
90) Comparative (anonyme) 411 500
91) A/an/Ø (bridg) 397 218
92) Future simple (lucile83) 394 747
93) Past simple (anonyme) 392 134
94) This / That / These / Those (webmaster) 391 774
95) Conditional (webmaster) 390 589
96) Passive voice (anonyme) 389 273
97) Comparing (webmaster) 387 432
98) Can / could/ may/ might (woodyrun) 378 375
99) Present perfect or past tense (anonyme) 375 393
100) Personal pronouns (anonyme) 370 970
101) Much, many, little and few (felin) 370 553
102) Some, any, no, enough, too/too much/too many (webmaster) 367 578
103) Preterite continuous (BE + -ING) (webmaster) 367 184
104) Genitive case (bridg) 366 700
105) Confusing words - Placement test (bridg) 364 235
106) Irregular verbs (webmaster) 362 688
107) Numbers from 1 to 10 (lucile83) 360 896
108) Past perfect simple, past perfect continuous (anonyme) 360 482
109) Present continuous or present simple (webmaster) 359 004
110) Present perfect or preterite? (anonyme) 354 510
111) Comparative Adjectives (bridg) 351 646
112) Simple Past : regular verbs (anonyme) 351 493
113) Who, Whom, Which, or Whose? (anonyme) 347 841
114) Past simple (video) (lucile83) 346 778
115) Past simple or past continuous (lucile83) 339 117
116) What time is it? (webmaster) 337 004
117) While / When (anonyme) 336 337
118) Modals (tinou) 335 856
119) Modal: may/might (lucile83) 333 561
120) Cardinal and ordinal numbers (anonyme) 327 953
121) Possessive adjectives and pronouns (woodyrun) 323 293
122) The superlative (anonyme) 322 616
123) How to talk about the weather (lili73) 320 816
124) Since and for (lucile83) 317 794
125) Flags (webmaster) 316 927
126) Irregular verbs (bridg) 315 284
127) Prepositions - in, on, at (anonyme) 313 672
128) Pronouns (woodyrun) 311 545
129) Tenses (anonyme) 310 633
130) Placement test 3 (webmaster) 309 906
131) Order of adjectives (webmaster) 305 840
132) Could/Couldn't (laure95) 305 318
133) Comparative (anonyme) 303 777
134) Adjectives and prepositions (lucile83) 303 710
135) Agreement Tags (webmaster) 303 459
136) Asking questions (webmaster) 302 428
137) Present perfect OR simple past? (bridg) 297 854
138) Questions in the past tense (lucile83) 296 718
139) Superlative Adjectives (bridg) 295 003
140) Uncountable nouns (webmaster) 294 893
141) Object pronouns (bridg) 293 565
142) Placement test 1 (lucile83) 291 971
143) Present simple (lucile83) 289 638
144) Prefer/rather (bridg) 288 592
145) Can/Must/Should (laure95) 288 179
146) Passive form (anonyme) 287 782
147) Must or Have to? (woodyrun) 286 153
148) Past perfect (lili73) 284 975
149) The/an/nothing (bridg) 284 488
150) To be (anonyme) 283 058
151) Vocabulary: asking and answering (here4u) 280 384
152) Can and can't (laure95) 278 982
153) Modal verbs (bridg) 276 830
154) Some / Any / no... (bridg) 269 694
155) Days of the week (bridg) 268 945
156) So / neither (anonyme) 263 910
157) Past simple (video) (lucile83) 263 191
158) Used to (bridg) 260 040
159) Past tense (anonyme) 258 753
160) Should / must (anonyme) 258 707
161) Vocabulary: on the phone (here4u) 258 650
162) Find out a quantity (webmaster) 258 320
163) Present continuous (chnawa) 256 882
164) Superlative + and adjective (lucile83) 256 432
165) Articles : a / an / the / Ø (anonyme) 254 225
166) Comparative and superlative (anonyme) 253 135
167) Numbers 1/100 (anonyme) 252 944
168) Modal can (video) (lucile83) 252 453
169) Relatives pronouns (who, which, that...) (anonyme) 247 730
170) Vocabulary: at the restaurant (here4u) 245 588
171) A few, a little, few, little (anonyme) 244 359
172) Would rather / would prefer to (anonyme) 243 855
173) Comparatives (anonyme) 243 120
174) Present continuous and the Going to form (anonyme) 242 062
175) Have something done (anonyme) 239 371
176) Should/ have to/ must (anonyme) 238 700
177) The past (webmaster) 237 531
178) Future continuous and future perfect. (felin) 237 186
179) Used to/would (woodyrun) 236 504
180) How to ask a question in English (bridg) 234 321
181) I wish, if only (felin) 233 742
182) Pluperfect (webmaster) 233 411
183) Countable or Uncountable? (webmaster) 232 649
184) Some / any (younes91) 230 910
185) Should / shouldn't (anonyme) 230 811
186) Present simple or continuous (bridg) 230 746
187) Adjectives - ing and ed (felin) 228 359
188) Hypothesis (webmaster) 227 500
189) Auxiliary BE (lucile83) 226 055
190) Articles a/an/the/0 (bridg) 225 851
191) Article The or nothing (anonyme) 225 452
192) Present perfect with Ever - never - (anonyme) 225 117
193) Present continuous OR Present simple? (bridg) 224 919
194) Must or mustn't (laure95) 223 891
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 222 441
196) To / in order to / so as to / so that (irish21) 219 155
197) Present perfect (bridg) 219 029
198) What time is it ? (anonyme) 217 275
199) Indirect speech (bridg) 215 466
200) Comparison (komiks) 215 445
